Trane VAL8579 TXV

The Trane VAL8579 TXV is a heavy-duty Flo-Rater thermal expansion valve designed for technicians servicing 1.5 to 3-ton R22 systems. This OEM expansion valve is functionally identical to part number D801527P04 and is engineered to maintain precise superheat at the evaporator coil, preventing liquid slugging and protecting the compressor from premature failure. Featuring a 30-inch capillary tube, this valve provides the necessary reach for flexible sensing bulb placement, ensuring accurate temperature feedback even in tight air handler cabinets.

Built for durability in both residential and light commercial applications, the VAL8579 manages refrigerant flow based on heat load demand. This precise modulation optimizes the refrigeration cycle, ensuring the system operates at peak efficiency. As a genuine Trane replacement part, it meets exact factory specifications for pressure drop and orifice sizing, eliminating the guesswork associated with aftermarket universal valves during a retrofit or repair.

Key benefits for contractors:

• Direct Compatibility: Seamlessly replaces D801527P04 and VAL08579 without requiring manifold modifications.
• Optimized Flow Control: Specifically calibrated for R22 refrigerant in systems ranging from 1.5 to 3 tons.
• Superior Sensing Accuracy: The 30" capillary tube allows for optimal bulb positioning on the suction line to ensure stable superheat.
• Heavy-Duty Construction: Built to withstand commercial-grade operating pressures up to 500 PSI.
• Improved System Longevity: Helps prevent compressor stress by ensuring a consistent refrigerant state.

Common Questions:

Is the Trane VAL8579 compatible with R410A systems?
No, this specific Flo-Rater TXV is engineered strictly for R22 refrigerant systems. Using it with R410A will lead to improper metering and potential system damage due to pressure differences.

Does this valve come with the sensing bulb insulation?
The VAL8579 includes the integrated 30-inch capillary tube and sensing bulb. It is recommended to use high-quality foam tape or insulation (sold separately) to ensure the bulb accurately reads the suction line temperature without ambient interference.

What is the ton range for this expansion valve?
This valve is rated for 1.5-ton to 3-ton capacities, making it a versatile service part for a wide variety of Trane and American Standard cooling units.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.